Tuyere



Sept. 10, 1929. 'G l Q RAWFORD 1,727,337

TUYRE I filed Feb. 1, 1926 POLISH ED JUE F'HCE Snowdon @Uw/@fof Patented Sept. 10, 1929..

Aviali-ED STATES m'rl-:Nf'rA oFFlcE.

GEORGE G. GRAWFOBD'LSMINGHAM, ALABAMA..

` Application mea February This invention relates to an improved type of tuyre. The invention will be understood from the following specification when read in connection with the accompanying drawings and the points of novelty will be pointed out with particularity in the appended claims.

In the drawings Fig. 1 is a vertical sectionof a portion of a blastfurnace showing my' improved tuyre installed therein ;l

Y Fig. 2 is a detail section illustrating two clxmponent parts of the tuyre beforeassem- Fig. V3 is a section through the complete tuyre; and

` Fig. 4 is a section on line4-4 of Fig. 3.

Referring in detail to the drawings, 10 is a portion of a blast furnace which is provided with a suitable cooler 11 havingan opening 12 for the tuyre which is indicated as a whole by numeral 14.

The tuyre is made in ltwo separately formed parts 16 and 18. The larger part 16 which I call the body portion comprises an outer shell 20 which is inclined with respect to the inner shell 22 so as to form an annular lchamber 24 for the circulation of suitable cooling medium. The shells 22 and 20 are united at the inner endby awall 26 which is .preferably integral with thewalls 20 and 22. The parts are preferably though not necessarily made of cast bronze or copper. The form of the tuyre is such that a. central blast opening 28 is provided and the air blast for the furnace is directed therethrough from a'suitable blast pipe 30 `as shown. The body 16 of my tuyre is so shaped thatv the cores used in casting or dies used i-n drawing sheet metal can be very easily and quickly removed. This feature is of importance because in blast furnace operations the tuyres must be frequently renewed.

Where the hollow tuyres are cast entirely..l

integral, it is extremely difficult to remove the sand cores after the casting is made. As shown in Fig. 2,.it will be seen that the chamber 24 is entirely open at 32 so that any core used in casting my tuyre can be readily removed. e open end also permita Y1, 192e. serial No. 85,281.

the smoothing and polishing the water chamber part of the tuyre which will minimize the deposit of sediment from the water and lmprove the eiciency of the cooling of the tuyre. Y

When manufactured in this manner, the walls of the tuyre will be of uniform thickness and. will therefore transmit equal amounts of heat per unit surface to the cool-l ing water and will therefore prevent hot spots in the tuyre and accomplish the most eic1ent cooling for any given wall thickness.

To close the opening 32, I preferably braze or weld a plate 18 of cast bronze or the like to the edges 34 and 36 of the respective wallsr 2O and 22. This joint may be formed 1n various ways such as by electric, arc or Oxy-acetylene welding; the important point being that a water tight joint be secured between the abutting surfaces.

The plate 1S is formed with a tapered central opening 38 which approximately registers with the central passage 28 in the body ,of the tuyre. Suitable threaded openings 40 and 42 are formed in the plate 18 for the reception of pipes 44 and 46 through which the water or other medium used for cooling the tuy`ere is circulated.

The term tuyre is intended to include 80 coolers, cinder notches, bosh plates and similar blast furnace appurtenances.

While I have described in detail the construction andmethod of making the tuyre illustrated, it is to be understood that the drawings and specifications are to be construed in an illustrative rather than a limiting'sense since various modifications may be made by those skilled in the art without d'eparting from the invention as defined in the 90 appended claims.

What I claim is A1. A blast furnace tuyre comprising two separately formed parts, one of which is a copper casting having a chamber formed therein for the circulation of a cooling medium, the other part being a cover united to said casting b a fused metal joint, said y chambered casting having walls of uniform thickness, the interior surfaces ef said walls 10o beingpolished so as to present an extremely smooth surface so as to minimize the deposit of sediment.

2. In combination with a. blast pipe, a 5 blast furnace tuyre comprising two sepa.-

rately formed parts integrally united by a welded joint, one being a cham red cast copper body portion whose inner walls are polliished to prevent the precipitation of sedi- 10 lment thereon, said body portion beingr formed with a central blast opening, the outer part comprising a plate of greater thickness than the walls of said body portion, said plate having a central openingr therein 15 matching the blast opening in the body portion but flared outwardly to. form a seaty for said blast pipe. i In witness whereof I have hereunto signed my name.

20 GEO. Gr. CRAWFORD. 

